Larissa ("LA ree suh") is the fifth of Neptune's known satellites: orbit : 73,600 km from Neptune diameter : 193 km (208 x 178) mass : ? Larissa was a daughter of Pelasgus. Harold Reitsema is now usually credited with the discovery of Larissa by ground-based stellar occultation observations. ... Like Proteus, Larissa is irregular (non-spherical) in shape and appears to be heavily cratered. from LANL . We know next to nothing about Larissa.. ... Bill Arnett ; last updated: 1997 Oct 29 . ...

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... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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The weather throughout this year was so extremely favorable that I have been able to observe the Sun clearly on 312 days; however, I counted only 34 groups of sunspots.. From my earlier observations, which I have reported every year in this journal, it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year.. ... 244 . ... 149 . ... Exploration" home page (index) Glossary . Official GSFC Home Page .. ...

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• Janus
• First X-Rays From a Comet Discovered
• Uranus' Moon Umbriel

... The weather throughout this year was so extremely favorable that I have been able to observe the Sun clearly on 312 days; however, I counted only 34 groups of sunspots.. From my earlier observations, which I have reported every year in this journal, it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year.. ... Year . ... Days when no . ... Observation Days . ... 273 . ... 282 . ... 244 . ... 149 . ...

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... All images on this page are copyright Robert H. McNaught. ... There have been so many requests for high resolution copies of these images that I ask that all enquiries for these to go directly to Science Photo Library. C/2006 P1 on Jan 18, 10:22 UT. Photo: R. H. McNaught, Siding Spring Observatory. Canon 5D, 135mm, f/2.0, 2 sec exp., ISO 1600 . ... ISO 200 . ... Canon 5D, 50mm, f/2.0, 30 sec exp., ... Canon 5D, 135mm, f/2.0, 120 sec exp., ... Canon 5D, 50mm, f/2.0, 110 sec exp., ...

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• Siding Spring Survey Follow-up Obs
• Siding Spring Survey 2003 XB22

Probing new worlds" Images are listed in the order in which they appear on the contact sheet (reading right to left). ... 2763-8.tif |19.2 |CSIRO's |The location of both the solar |CSIRO's Dover Heights field | ... Photo: CSIRO | ... NOT FOR USE. ... image. ... MB |galaxy |from the optical image |information for the two images | ... CenA_AAT7.tif) and radio image |used in the composite. | ... Large Array radio telescope of the |courtesy of NRAO / AUI / NSF | ... CSIRO's Parkes radio telescope. | ...

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Image credit: Michael Nolan, Arecibo Observatory. These radar images of near-Earth asteroid 2001 SN263 were obtained on 2008 Feb 12 and 13. ... Image from Feb 12 . ... First near-Earth triple asteroid discovered by Arecibo Observatory . ... was discovered this week by astronomers at the sensitive radar telescope at Cornell University?s Arecibo Observatory in Puerto Rico. ... For example, Arecibo has discovered more than half of the near-Earth binary asteroid systems discovered since 1999. ...

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• Magellanic Stream
• What is a pulsar?

A New Storm on Saturn . ... With a 12 inch diameter telescope and web cam they recorded this sharp image of the ringed gas giant and made an exciting discovery -- a new storm on Saturn. The storm appears as the white spot visible here in Saturn's southern hemisphere (south is toward the top in the picture). In particular, the storm seems to correspond with an outburst of radio noise detected by the Cassini spacecraft. ... NASA Web Site Statements, Warnings, and Disclaimers . ...

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• Edmund Halley's Greatest Discoveries
• Астронет > Edmund Halley's Greatest Discoveries
• Ice Fountains Discovered on Saturns Enceladus

The Discovery of the Galilean Satellites . ... Probably the most significent contribution that Galileo Galilei made to science was the discovery of the four satellites around Jupiter that are now named in his honor. Galileo first observed the moons of Jupiter on January 7, 1610 through a homemade telescope. He originally thought he saw three stars near Jupiter, strung out in a line through the planet. ... Galileo's Observations of Jupiter's Moons . ... Jupiter . ...

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• New Moons of Uranus
• Uranus' Moon Umbriel
• Neptune's Moon Thalassa

Next: Star Formation and Stellar Up: Stellar Astrophysics Previous: The Chemical Evolution of . Amir Ahmad and Simon Jeffery have been studying some rare stars known, loosely, as helium-rich subdwarfs. ... Further study showed that PG1544+488 is in fact a double star with both stars having extremely helium-rich surfaces -- the first case known. ... Next: Star Formation and Stellar Up: Stellar Astrophysics Previous: The Chemical Evolution of M.E. Bailey . ...

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• Discovery of Bi-directional Jets at Coronal Hole Boundaries
• Armagh Observatory
• PULSATION PROPERTIES

... The search for distant objects which can be both galaxies and quasars is one of the most important problems of observational astrphysics, because it allows one to determine cosmological parameters connected with the time of appearence and evolution of stellar systems, large scale structure of the Universe. ... Radio galaxies are important objects to be studied because they are sources of infrared-optical-ultraviolet continuum, emission lines and continual radio emission. ...

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• Fabry-Perot Interferometer: Gallery Old

Astronotes Armagh Planetarium's Stellar Blog! ... This image combines orbital imagery with 3-D modelling to show flows that appear in spring and summer on a slope inside Mars' Newton crater. ... Warm season flows on a slope in Newton Crater, possible evidence of salty liquid water active on Mars today. Image credit: NASA) . ... Frozen water is common on and under the surface of Mars but these images are the best evidence to date for the presence of liquid water on the Martian surface today. ...

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• How do galaxies form? - New discovery from European Southern Observatory |
• Kepler-10b: world of lava oceans? | Astronotes
• Most distant galaxy ever seen | Astronotes

SN 1999aa - A Third Supernova Discovery . Just 9 weeks after the discovery of SN 1998ey a suspect was found 1" east and 28" north from the centre of NGC 2595 on Feb.11.0166 U.T.. ... Further inspection of 6 images of NGC 2595 taken during Feb. and March 1998 showed no object at the position of the suspect. ... Beijing Astronomical Observatory recorded SN 1999aa on Feb. 11.6 and 12.6 UT, the first obervation being only 14 hours after the discovery. ... Back to Supernova 1999aa in NGC 2595 . ...

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• Supernovae 2010jl in UGC 5189A
• Supernova 1999cl in M88
• Discovery of Supernova 2000C in NGC 2415

This image from VISTA is a tiny part of the VISTA Variables in the Via Lactea (VVV) survey that is systematically studying the central parts of the Milky Way in infrared light. On the right lies the globular star cluster UKS 1 and on the left lies a much less conspicuous new discovery, VVV CL001 тАФ a previously unknown globular. The new globular appears as a faint grouping of stars about 25% of the width of the image from the left edge, and about 60% of the way from bottom to top. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7BA8A98504-4F42-4DBF-A33D-37E6E4A628CD%7D
• Can you explain Mercury's retrograde motion? Do other planets appear to do this
• Why do some stars appear to flash a variety of different colors when you look

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... des actualit†йs . ... les plus belles images de l'Univers d†йcrypt†йes pour vous . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Discovery cтАЩest fini ! ... Pour c†йl†йbrer ce dernier vol, la NASA a assembl†й plusieurs films r†йsumant les instants marquant des la derni†иre mission de la navette Discovery : . ...

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• Observez le dernier vol de Discovery | Ciel et Espace
• Le dernier vol de la navette Discovery | Ciel et Espace

2012 A Broadband Study of the Emission from the Composite Supernova Remnant MSH 11-62 (P. Slane et al.) ... 2012 Infrared imaging and polarimetric observations of the pulsar wind nebula in G21.5-0.9 (A. Zajczyk et al.) ... 2009 High-resolution X-ray Observations of the Pulsar Wind Nebula Associated with the Gamma-ray Source HESS J1640-465 (A. Lemiere, P. Slane, B.M. Gaensler, S.S. Murray) - ApJ, 706, 1269 . ... 1995 Soft X-Ray Emission From Selected Isolated Pulsars (P. Slane N. Lloyd) ApJ 452, L115 . ...

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• The galaxy M100
• The AstroStat Slog EPO
• The AstroStat Slog Blog Archive ChandraBlog

Seven months ago, on Mar 19, 2008, at 09:12 Moscow time, a new star appeared on the sky. The Sun had already risen over the Russia, but people of the Western hemisphere might be able to see by their eyes a faint starlet near one of Bootes constellation stars. This starlet appeared and faded by an order of magnitude in a minute. Astronomers named it GRB080319B or, informally, the Naked-Eye Burst, as it was twice as bright as human eye can see a star. ... Royal Astronomical Society . ...

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• RCJ0311+0507
• Discovery of an isolated dwarf spheroidal galaxy neighboring the Local Group
• Galaxy sector, archive 2004

home publications > mercury . ... Astronomy Beat . ... Nearly four centuries ago, Galileo's simple observations of Earth's planetary sibling, Venus, buoyed the proponents of a Copernican universe. ... The Italian astronomer had settled into a new house in Florence and had begun to observe Venus, which in November 1610 would have appeared as an evening star, bright in the western sky after dusk. ... From these two observations, Galileo inferred that Venus must orbit closer to the Sun than does Earth. ...

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• ASP: Astronomy in the News
• ASP: Using Multicultural Dimensions to Teach Astronomy
• ASP: Gamma-Ray Bursts: Piecing Together a Cosmic Puzzle

Databases (NSDC) of the Natural Planetary Satellites. ... NSDC: Database of astrometric observations of Natural Planetary Satellites . ... They are thoroughly looking for observations in different sources, creating their owndatabases which are then mostly inaccessible to other researchers. ... In the file "content" with explications, the reference is given to the data source as well as the bibliographic reference. ... Data sources. ... Why a specific bibliographic database for Natural satellites? ...

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Astronomy Discussion Forums . ... God and Science ћ SETI ћ Software ћ UFO ћ XEphem . ... A Sensational Discovery . ... Post Message | ... It is citing the Kalashnikov gun instance. ... The new ones is inclosing in following: the Law of Pulse(Momentum) is acting until the bullet and the gun clash something. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• New Model: How Do The Sun And Moon Appear To Move Across The Sky - an Astronomy
• Discovery Telescopes, Inc., AstroGuide Listing